Stuart Miles, founder of technology and gadget site Pocket-lint, says he thinks the Facebook announcement will be the launch of an enhanced app for the social network.
My initial thought was that they couldn't possibly be launching a phone because that would be silly, because every phone is already a Facebook phone.
I think ultimately this will be an enhanced app that you can run from your homescreen on Android which will give you the feeling that your phone is a Facebook phone.
The launch of an "enhanced app" would reinforce Facebook's "mobile first" attitude, Miles added, as users increasingly monitor the social networking site from smartphones and tablets, rather than desktop computers.
More top news
After a wintry end to last week, a fast track to summer
The Tooting MP has been the frontrunner in the counting process ahead of Tory challenger Zac Goldsmith.
North Korea's leader hailed the testing of a H bomb as his greatest achievement in office during the first congress in 36 years.